Abstract
Background
The duodenum plays a role in the mechanism of type 2 diabetes remission after bariatric
surgery. Roux-en-Y gastric bypass (RYGB) may change gene expression in the duodenum
and metabolism. Long noncoding RNAs (lncRNAs) constitute a novel class of RNAs that
regulate gene expression. Little is known about how duodenal lncRNAs respond to RYGB.
Logically, studies on the changes of duodenal lncRNAs potentially can lead to an understanding
of the mechanisms of bariatric surgery, as well as discovery of antidiabetic drug
targets and biomarkers predicting postoperative outcome.
Objectives
To investigate the expression signature of duodenal lncRNAs associated with glycemic
improvement by duodenal-jejunal bypass (DJB), a component of RYGB, on a genome-wide
scale in high-fat diet–induced diabetic mice.
Setting
University medical center.
Methods
High fat diet–induced diabetic mice were randomized into 2 groups receiving either
the DJB or a sham procedure. Microarray was applied to screen the differentially expressed
lncRNAs and messenger RNAs (mRNAs) in the duodenum between the DJB and sham groups,
and the result was validated by quantitative real-time polymerase chain reaction in
another cohort of animals. Gene ontology (GO) and Kyoto Encyclopedia of Genes and
Genomes (KEGG) pathway analyses were performed to predict the potential lncRNA functions.
Based on Pearson correlation analysis, the lncRNA-mRNA and lncRNA-transcription factor
(TF) interaction networks were constructed to identify and rank core regulatory lncRNAs
and transcription factors.
Results
A total of 301 lncRNAs, including 232 that were upregulated and 69 downregulated (fold
change≥2.0), were differentially expressed in the duodenum between the DJB and sham
groups. GO enrichment indicated that these lncRNA-coexpressed mRNAs were correlated
with biological processes including cell proliferation, digestion, and catabolic and
biosynthetic processes. KEGG pathway analysis revealed that in addition to the digestion
and absorption signaling pathways, pancreatic secretion– and inflammatory process–related
signaling pathways were mostly enriched in the DJB group. In addition, the lncRNA-mRNA
interaction network combined with GO and KEGG pathway analysis suggested that as a
top-ranked gene, NONMMUG021726 may play an important role in the mechanism of type
2 diabetes remission after DJB.
Conclusion
DJB leads to drastic changes in lncRNA and mRNA expressions in the duodenum. The majority
of top-ranked lncRNAs and mRNAs have roles in pancreatic secretion and inflammatory
processes, implying that bypass of the duodenum may initiate insulin secretion and
attenuate inflammation. In addition, modulators of such lncRNAs, most likely NONMMUG021726,
have potential to become therapeutic targets or biomarkers for prediction of the outcomes
of bariatric surgery.
Keywords
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Article info
Publication history
Published online: February 18, 2017
Accepted:
February 9,
2017
Received in revised form:
February 7,
2017
Received:
October 20,
2016
Identification
Copyright
© 2017 American Society for Metabolic and Bariatric Surgery. Published by Elsevier Inc. All rights reserved.